diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4fcc6532f..6d20f0ca5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -68,7 +68,7 @@ jobs:
           cabal v2-build --enable-tests --disable-optimization 2>&1 | tee build.log
           # fail if warnings in local build
           ! grep -q "[Ww]arning:" build.log
-          cabal v2-test
+          cabal v2-test --disable-optimization
 
   windows: